Supplemental jaw attachment for- hand-screws



(No Model.)

A. DE LASKI.

SUPPLEMENTAL JAW ATTAGHMENT FOR HAND $GREWS. No. 306,592,. Patented Oct. 14,1884,

Lu/env/i n 22 U w d Lithogra her, Washington. D. c.

N. PETERS. Photolhvrren Starts ALBERT DE LASKI, OF

PATENT trier...

LYN N, MASSACHUSETTS.

SUPPLEMENTAL JAW ATTACHMENT FOR HAND=SCREVVS.

SPECIFICATION forming part of Letters Patent No. 306,592, dated October 14,1884:. Application filed February 15, 1884. (No model.)

fr) it whom it may concern.-

Be it known that I, ALBERT DE LASKI, of

Lynn, in the county of Essex and State of Massachusetts, have invented certain Improvements in Supplemental Jaw Attachments for Hand-Screws, &c., of which the following is a specification.

This invention has for its object to provide a supplemental jaw attachment for hand screws, Vises, and equivalent clamping devices, whereby objects of various forms may be securely held.

The invention consists in the provision of a pivoted jaw or jaws adapted to be adjusted to any desired angle with relation to the main jaw or jaws, and means as hereinafter de scribed and claimed, for supporting said pivoted jaw or jaws in any position to which they may be adjusted, so that said pivoted jaws will be practically rigid when in use.

The invention also consists in the provision of a plate or holder, to which the supplemental jaw is pivoted, said plate being adapted to be dctachably connected to one of the main jaws by the connections hereinafter described and claimed.

The invention also consists in certain details of construction, all of which I will now proceed to describe and claim.

Of the accompanying drawings, forming a part of this specification, Figure 1 represents a side elevation of a hand screw or clamp pro 'vided with my improvements. Fig. 2 represents alongitudinal section of the same. Fig. 3 represents a perspective view of the attachment. Figs. 4, 5, and 6 represent sectional views of one of the main jaws. Fig. 7 represents a modification.

The same letters of reference indicate the same parts in all the figures.

In the drawings, a a represent the jaws of a hand-screw of the ordinary general construction, and b I) represent the screws which connect said jaws'in the usual manner.

In carrying out my invention I provide plates or holders (2 (1, adapted to be detachably secured to the jaws a a in any suitable manner, preferably by means of lugs t i, formed on the back of each plate, and grooves j, formed in the main jaws a to receive said lugs. Said lugs and grooves may be T-shaped in crosssection, as shown in Fig. 5, or laterally arranged, as shown in Fig. 6,-so that the engagement of the lugs with the grooves will retain the plate (1 in contact with the jaw a. When the lugs and grooves arenot adapted by their form to prevent the plate from being laterally separated from the jaw, the plate may have lugs z" 'i at its edges adapted to bear against the sides of the jaw a, said lugs i being screwed to the jaw. In either case the plate (Z is adapted to be readily applied to and removed from the jaw a, so that the latter can be used without the attachment, if preferred.

0 6 represent the supplemental jaws, which are pivoted at c c to the plates d d, and are adapted to be inclined at any desired angles with relation to said plates. v

f f represent segmental arms or braces, which are pivoted at ff to the supplemental jaws, and project through slots in the plates d d and jaws a (I. Said arms or braces are provided with ratchet-teeth t on their convex sides. Said teeth are caused by springs m on the back sides ofthe supplemental jaws to press the toothed sides of the arms or braces f against corresponding teeth, t, formed at the ends of the slots in the plates (1, through which the arms or braces pass, said springs in bearing against offsets f formed on the arms f. The teeth t are formed to slip on the teeth 15 when the arms or braces f are being drawn outwardly to increase the angle of the supplemental jaws with relation to the fixed jaws, but when inward pressure is exerted on the supplemental resist such pressure. It will be seen, therefore, that either of the supplemental jaws can be readily adjusted to any desired angle with the main jaw, to which it is applied, and is positively held against inward pressure by its brace f at any angle to which it may be ad justed. The hand screw can therefore be adapted to hold triangular, wedge-shaped, or other objects having opposite sides which are not parallel.

It is obvious that only one of the jaws a may be provided with this attachment, as shown in Fig. 7.

The brace or arm f may be pivoted either to the inner or to the outer end of the supplemental jaw.

If preferred, the plate or holder (Z may be reversible, so that it may be applied to the jaws the teeth t and t become engaged and jaw a with the brace f either at its inner or its outer end.

This improvement is applicable to vises and other clamping-tools as well as to hand-screws. v

lhe supplemental jaws may be faced with rubber or other yielding material to prevent injury to polished surfaces of articles held thereby.

I claim- 1. An attachment for a jaw of a handscrew or equivalent clamping device, said attachment consisting of a plate or holder adapted to be detachably secured to said jaw, a supplemental jaw pivoted to said plate or holder, and a toothed adjustable brace pivoted to the supplemental jaw and adapted to engage by its teeth with a detent and hold the supplemental jaW at any desired angle with relation to the plate or holder, as set forth..

2. The improved clamping-jaw attachment consisting of the plate or holder d, adapted to be secured to a clamping-j aw, a, the supplemental jaw 0, pivoted at one end to said plate, the notched brace f, pivoted to the supplemental jaw and provided with a spring, whereby its toothed face is pressed against a tooth or shoulder on the plate d, as set forth. I

3. The combination, with the main jaw having a longitudinal groove or slot, of the plate or supplemental jaw-holder, adapted to enter said groove, and provided on its back with a lug or lugs, 1', adapted to enter said groove, and at its edges with lugs z" i, adapted to bear against the sides of the main jaw, as set forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 13th day of February, 1884.

ALBERT DE LASKT.

W'itnesses:

G. F. BROWN, A. L. WVHrrn. 

